GAS-PHASE CHEMISTRY OF 1ST TRANSITION SERIES CARBONYL METALLATE IONS, [METAL(CO)X]- - REACTIONS WITH C-13-LABELED AND O-18-LABELED CARBON-DIOXIDE - A FOURIER-TRANSFORM ION-CYCLOTRON RESONANCE STUDY

Gas-phase reactions between (CO2)-C-13 and (CO2)-O-18 and a series of carbonyl metallate ions [Metal(CO)x]- with x = 3, 4 for the metals chromium, manganese, iron and also x = 2 for iron, have been examined at low pressures by Fourier-transform ion cyclotron resonance mass spectrometry. While the 16- and 17-electron ions [Mn(CO)4]- and [Fe(CO)4]- were unreactive, both ligand displacement and oxidative reactions have been identified for the other 13-, 14- and 15-electron metal-ion systems as a consequence of Metal-C, O = C-13 and O-18 = C cleavages in [(CO)x.Metal.eta(2)-OCO]- intermediates.